Commit 8e08b976 authored by David Vrabel's avatar David Vrabel Committed by Greg Kroah-Hartman
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USB: allow interrupt transfers to WUSB devices 



Check urb->interval on interrupt transfers and allow those with valid
values (6 <= interval <= 16).

Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 294a39e7

drivers/usb/core/urb.c

+18 −4
Original line number Diff line number Diff line
@@ -429,8 +429,16 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) 
	case USB_ENDPOINT_XFER_ISOC:

	case USB_ENDPOINT_XFER_INT:

		/* too small? */

		switch (dev->speed) {

		case USB_SPEED_VARIABLE:

			if (urb->interval < 6)

				return -EINVAL;

			break;

		default:

			if (urb->interval <= 0)

				return -EINVAL;

			break;

		}

		/* too big? */

		switch (dev->speed) {

		case USB_SPEED_SUPER:	/* units are 125us */
@@ -438,6 +446,10 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) 
			if (urb->interval > (1 << 15))

				return -EINVAL;

			max = 1 << 15;

		case USB_SPEED_VARIABLE:

			if (urb->interval > 16)

				return -EINVAL;

			break;

		case USB_SPEED_HIGH:	/* units are microframes */

			/* NOTE usb handles 2^15 */

			if (urb->interval > (1024 * 8))
@@ -461,9 +473,11 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) 
		default:

			return -EINVAL;

		}

		if (dev->speed != USB_SPEED_VARIABLE) {

			/* Round down to a power of 2, no more than max */

			urb->interval = min(max, 1 << ilog2(urb->interval));

		}

	}



	return usb_hcd_submit_urb(urb, mem_flags);

}